Smartwatches are all the range at CES, but can you really write an email on the tiny screen of a smart watch? Swype likes to think that you can. The Android app modifies the keyboard so that it doesn’t require tapping and instead lets users slide their finger over the keys in order to trace words. Swype is not perfect but Nuance thinks that it is ideal for small screens and acquired the company for $100 million in 2011.